Abstract
TPPase and NDPase were studied in 24 cerebral tumours. Gliomas show intense parenchymal staining both with IDP and TPP. Dissociated responses are observed using different divalent ions. With IDP the intensity and distribution of the reaction do not vary when Mn++ is substituted by Ca++ and Mg++. With TPP the staining of tumor cells is greatly reduced when Ca++ and Mg++ are used instead of Mn++. Small structures can thus be observed in the cytoplasm, especially in areas of protoplasmic and large astrocytes, which resemble the Golgi apparatus.
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